The DCB T-Extender is a 4-wire T-1 repeater for use on customer owned t1 lines.
The T-Extender is a t1 repeater used to extend in-house T-1 lines in campus and high-rise
environments.

Note: This product is NOT intended for 10BaseT
or Ethernet. T1 modulation is designed for use with twisted pair solid wire
phone cables. The T-extender does NOT extend ethernet connections... only T1
connections. To extend ethernet 10/100/100BaseT cables, see our Ethernet-Extender here.

Each pair of T-Extenders may be located up to 5000 feet apart. Solid
copper 22 AWG two twisted pair is the preferred cable for connection between
T-Extenders. Smaller wire sizes will reduce the functional distance between
T-Extenders. Connection to the T-Extender is made through RJ-45 modular
connectors or 4-wire screw down barrier strips. Both types of connectors are
standard on the T-Extender.

The DCB T-Extender is often powered by a small wall-mount transformer. 12, 24, -48, and 125 VDC versions are available. It is used to extend connections between T-1 equipment such as PBXs, T-1 multiplexers, T-1 line drivers, T-1 local multiplexers or any other T-1 equipment requiring
long customer owned cable runs. T-Extenders may be used to connect this equipment across a campus, between floors of a high-rise office building or between office buildings with underground cable connections.

While stand-alone units are most commonly used, a 1U rack mount is available that mounts three T-Extenders in a 19" rack. A 20 slot chasis is also available which contains up to 20 board-level T-Extenders and common power supplies.

T-Extenders can also be used to extend the distance between any T-1 equipment (DSU, channel bank, router, etc.).

The T-Extenders are best used in pairs. If you have a T1 CSU that is
limited to 655 feet, connected to a device limited to 655 feet, and you put
the T-Extender at one end, the T-Extender will drive the extra distance.
However, the far end device will still be limited to 655 feet and will not
likely have sufficient "drive" to reach the far end. The T1 transmitted
signal is the issue addressed by the T-Extender, so in this case, the line
would be error-prone or possibly only work in one direction. For cable runs greater than about 5,000 feet, additional T-Extenders may be cascaded

T-1 repeater
Extends T-1 bi-polar signal
Up to 5000 feet between T-Extenders
Up to 5000 feet to equipment with ALBO (Automatic Line Buildout)
Up to 655 feet from ABAM signalling equipment with 4-wire cross connect
cabling

Many technicians installing T-Extenders for the first time don't have all the cables required to set up a pair of T-extenders and demonstrate that the T-1 line and other equipment operates properly on a work bench, or in the telephone closet. This kit includes all the parts needed to install two T-Extenders and the CPE within reach of the telephone company demarc, as well as a physical loopback RJ-45 plug to use diagnosing any problems that occur. Parts included are one T-1 straight-through cable, two T-1 crossover cables, two RJ adapter boards, and one T-1 RJ loopback plug.

T-1 Cables and Cross-Talk We receive many questions about what kind of cable works best for T-1 extensions. Many people mistakenly believe Cat-5 or Cat-6 LAN cable works well. Here's the scoop... a technical discussion about why you should use real T-1 cable for every T-1 installation, and some manufacturer's part numbers. T-1 Cables and Cross Talk